G2 Gas Fitter Practice Exam

What would be the likely cause of orange flashes in a gas flame?

1. Excessive gas pressure

2. Humidity in the gas

3. Dust burning in the flame

4. Faulty burner design

The correct answer is: Dust burning in the flame

The presence of orange flashes in a gas flame typically indicates the combustion of impurities or particles present in the gas. When dust or other particulate matter enters the flame, it can ignite and produce orange or yellow colors due to the incomplete combustion of these materials. The orange coloration is a result of incandescent solid particles (often carbon) that emit light when heated. This phenomenon is common when the gas burner is improperly cleaned or if the source gas is contaminated, suggesting that regular maintenance and proper handling of the burner are crucial for optimal performance and safety. Other choices, while they may seem plausible, do not explain the specific visual indicator of orange flashes in the flame as well as the combustion of dust or foreign particles does.